Robert James Fitzsimmons (26 Mei 1863 – 22 Oktober 1917) adalah seorang petinju profesional asal Inggris yang membuat sejarah tinju sebagai juara dunia tiga divisi perdana dalam bidang olahraga tersebut.[1][2] Ia juga meraih ketenaran karena mengalahkan Gentleman Jim Corbett, (pria yang mengalahkan John L. Sullivan), dan ia masuk The Guinness Book of World Records sebagai juara kelas berat terringan.[3]
^McWhirter, Norris. The Guinness Book of World Records 1997. p.467. " Lightest heavyweight champion Robert James "Bob" Fitzsimmons of Great Britain, weighed 165 pounds when he won the title by knocking out James J. Corbett". Random House Publishing Group, 1997
"HEROES OF THE RING IN DOUBT". Los Angeles Herald. 28 June 1906. hlm. 10. Diakses tanggal 8 January 2017. Jim Corbett was a bank clerk. He's an actor at present. Bob Fitzsimmons was a blacksmith. He is running a farm now, doing monologue turns and fighting between times.
"RING VETERAN TO GIVE VIEWS". San Francisco Call. 27 June 1910. Diakses tanggal 8 January 2017. After all the contest on July 4 between Jeffries and Johnson will be a fight, and who better than a fighter can convey the idea of the intensity of the struggle, the courage that is required, the force that will be exerted and who better than Bob Fitzsimmons...
"DEATH OF 'LANKY BOB' SHOCKS LA FRIENDS". Los Angeles Herald. 22 October 1917. Diakses tanggal 8 January 2017. died in a Chicago hospital early this morning of pneumonia
